diff --git a/packages/theme-chalk/gulpfile.js b/packages/theme-chalk/gulpfile.js
index bdd65c1194..2fb9b492e5 100644
--- a/packages/theme-chalk/gulpfile.js
+++ b/packages/theme-chalk/gulpfile.js
@@ -6,13 +6,15 @@ const autoprefixer = require('gulp-autoprefixer')
 const cssmin = require('gulp-cssmin')
 const rename = require('gulp-rename')
 
+const noElPrefixFile = /(index|base)/
+
 function compile() {
   return src('./src/*.scss')
     .pipe(sass.sync())
     .pipe(autoprefixer({ cascade: false }))
     .pipe(cssmin())
     .pipe(rename(function (path) {
-      if (path.basename !== 'index') {
+      if(!noElPrefixFile.test(path.basename)) {
         path.basename = `el-${path.basename}`
       }
     }))